Guardian of the Rainbow Bridge
UNIQUE- All Champions except Heimdall: Once per fight Heimdall will intercede on your behalf, the first time you would be knocked out gain both an Indestructible and an Unstoppable Buff which last for 2 seconds.

Every sig anchor × rank at A0. Sig levels in between interpolate smoothly (PCHIP) and round to the nearest 10 BHR — matching the in-game display.
| Sig | R3 | R4 | R5 |
|---|---|---|---|
| 0 | 18,020 | 22,000 | 26,090 |
| 20 | 23,080 | 28,170 | 33,420 |
| 40 | 23,830 | 29,090 | 34,510 |
| 60 | 24,460 | 29,860 | 35,420 |
| 80 | 25,030 | 30,540 | 36,240 |
| 100 | 25,540 | 31,170 | 36,980 |
| 120 | 26,020 | 31,760 | 37,680 |
| 140 | 26,480 | 32,320 | 38,340 |
| 160 | 26,910 | 32,840 | 38,960 |
| 180 | 27,330 | 33,350 | 39,570 |
| 200 | 27,720 | 33,840 | 40,140 |
BHR at each signature level by rank (non-ascendable — A0 only). The curve is concave — sig 0 → 100 captures roughly two-thirds of the gain from sig 0 → 200.